TCI TH400 Ultimate Master Racing Transmission Overhaul Kit ' 66and Newer MagnaFuel Bump Springs are used in

Bump Springs are used in conjunction with a primary spring to allow a race car to have a relatively soft / compliant initial spring rate to get down to the desired optimum ride height and then pick up the rate of the bump spring to achieve a constant / optimum dynamic ride height

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TASS Series

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TCI TH400 Ultimate Master Racing Transmission Overhaul Kit ' 66and Newer MagnaFuel Bump Springs are used in66 '91 TH400 Ultimate Master Racing Overhaul Kit.. This TCI Ultimate Master Racing Overhaul Kit includes all of the best performance clutches, frictions and steels for your next TH400 Transmission Overhaul. The Ultimate Master Racing Overhaul Kit from TCI contains the performance clutches, frictions and steels made from the strongest, most durable materials available for your transmission upgrade. Best suited for applications exceeding 450 HP, TCI